January 29, 200818 yr I gentleman over on TeamBultaco (Yahoo Group) posted these pictures. With his permission I'm reposting them here. Does anyone know the history behind this bike? Were they ever produced?
January 29, 200818 yr It's very well done, there is an article on it somewhere on the net but can't remember where now. However, someone has done an even better one than that. On Todotrial somewhere, there's a picture of a blue Bult converted to 4 stroke using the Bult bottom end - you have to look twice to realise the top end is not what it should be.
January 29, 200818 yr Has been done before to Montesa by PORTUS a well known preparator around Barcelona, he used a Sandglass 4 stoke head mounted on 348 Montesa, going back around 20 years, was a very nice thing.
January 29, 200818 yr Author bleutooth ? Close. I found a Spanish trials forum that mentioned (in translated English) a toothed belt and showed the same picture as above. No picture of the right side. I assume that it was driven from the crank end. I believe the Montesas were gear driven primaries so no chain (like a Bultaco) to get in the way. The bike is now apparently in a Spanish museum. The Bassella Motorcycle Museum
January 30, 200818 yr Dave, read the pamphlet carefully. It's a homebuilt. A VERY professional job but still a homebuilt.
January 30, 200818 yr I've never seen the Portus Montesa before, nor even heard of the Rotax Bultaco - which does look a little large in the stretched out frame. Excellent postings. I saw the 4T Bultaco aslo in Todotrial, it looked like a Honda TLR250 top end on a Bultaco M199 bottom end, got me thinking for my next project! I always fancied building up a 4T with a spare Bult bottom end, I wonder where the oil pump would be driven off and how to get the oil onto the camshaft. Bye, PeterB.
January 30, 200818 yr A one off project from Manel Blancafort From: http://todotrial.mforos.com/65594/4821907-...ferentes/?pag=2
January 30, 200818 yr Author Dave, read the pamphlet carefully. It's a homebuilt. A VERY professional job but still a homebuilt. Yes, I'm sure the first one was homebuilt. I was just wondering if any more were made and why they weren't through the trouble of making a brochure.
January 30, 200818 yr To finish off the job and to fool poor saps like us? The brochure is photoshopped. Look carefully at the Bultaco logo on the first page.
January 30, 200818 yr Hi spud plark, Thanks for posting the photos and the Bultaco link. I had a look for a photo of the mag side of the 4T Bult but nothing there, wanted to see how the drive was accommodated for the camshaft. I'll try the guy who posted the original info. Bye, PeterB.
January 30, 200818 yr Judging by the photos only, the insertion of a full 4 stoke motor with OHV in any conventional trials frame still,even with the Montesa & Sherco on the market today, has the problem of the height of the motor. The ground clearance on the Bultaco picture looked to be a third LESS. But good news is to hand. Has anyone seen the GasGas 4 stroke protype - it uses a SIDE VALVE ( remember them Big John ) to reduce the height issue
January 30, 200818 yr Author To finish off the job and to fool poor saps like us?The brochure is photoshopped. Look carefully at the Bultaco logo on the first page. My first impression too. Except that if they were good enough to fake the stamped address on the back they would have been able to make a decent brochure (cleaned up the Bultaco logo, etc.) I'm more along the lines that someone mocked up a quick brochure in the hopes of perhaps moving this into "production".
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.